Supporters present in stand going wild (9)
I believe the answer is:
adherents
'supporters' is the definition.
(I've seen this before)
'present in stand going wild' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'in' indicates putting letters inside.
'going wild' indicates anagramming the letters.
'stand' anagrammed gives 'adnts'.
'here' inserted inside 'adnts' is 'ADHERENTS'.
(Other definitions for adherents that I've seen before include "Followers" , "Supporters of neatherds" , "'Supporters, disciples (9)'" , "Supporters of neat herds" .)